In January of year 0, Justin paid $4,800 for an insurance policy that covers his business property for accidents and casualties. Justin is a calendar-year taxpayer who uses the cash method of accounting. What amount of the insurance premium may Justin deduct in year 0 in each of the following alternative scenarios?

a. The policy covers the business property from April 1 of year 0 through March 31 of year 1.

b. The policy begins on February 1 of year 1 and extends through January 31 of year 2.

c. Assume Justin paid $6,000 for a 24-month policy that covers from April 1, year 0 through March 31, year 2.

d. Assume that instead of paying an insurance premium, Justin paid $4,800 to rent his business property from April 1 of year 0 through March 31 of year 1.